iPhone 6s cannot update past iOS 15 which means you'll have to access eBay via a web browser on your device until you can upgrade your phone. If links keep opening in the app you can delete the app which will keep links within your browser.
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See directions and screenshots at the below link, including what to do if your OS is outdated.
wastingtime101
·1 year ago@juno2808
iPhone 6s cannot update past iOS 15 which means you'll have to access eBay via a web browser on your device until you can upgrade your phone. If links keep opening in the app you can delete the app which will keep links within your browser.
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See directions and screenshots at the below link, including what to do if your OS is outdated.
How to update your eBay app